IMPEDANCE MATCHING IN A MICROWAVE ELECTROSURGICAL SYSTEM

摘要

A method and apparatus is disclosed for the ablation of biological tissue to produce a therapeutic effect. An adjustment is made to the output frequency of an electrosurgical generator during the ablation cycle to accommodate changes in the electrical properties of the apparatus and the biological tissues that occur as energy is transferred to the tissue. The adjustment is made to better align the source impedance with that of the load.

主权项

1. A method of biological ablation, comprising:
positioning a microwave antenna within or in proximity to target tissue; delivering microwave energy, at a predetermined frequency, to the target tissue via the microwave antenna; sampling a power signal reflected by the target tissue; measuring a reflected power based on the sampled power signal; multiplying the measured reflected power by a correction factor to calculate an actual reflected power; and adjusting a power level of the microwave energy based on the actual reflected power.